Important avatar upload doesn't work

I installed Kunena 1.5.13 a few weeks ago and most of it works great!
But i can't upload new avatar images.
After I select an image file and click "upload" I get a script error "window.addevent is not a function"

When I look at the runtime-generated source code I find an alert messages, that should be triggered with "window.addevent('domready'..." which says (German version)"Erst eine Datei auswählen, dann hochladen" which means in english: "select a file before upload"

I already checked the permissions for the media folder for avatars.
I copied an image file into the avatar directory using FTP and it works fine.
It is even possible to upload images to a forum post.

If you want to try yourself: schuldenhilfswerk.at
You can register, or even try to add posts, but your entries will not appear, because they have to be released by a moderator.

Thanks in advance,
Hannes

I installed Kunena 1.5.13 a few weeks ago and most of it works great!

Why you didn't installed K 1.6.1 in that time? Now is also K 1.6.2?

Even Kunena number is 1.6.2 it not mean it's not for Joomla! 1.5... Kunena 1.6.x is made for Joomla! 1.5.19 or newer...

Kunena 1.6.2 Read Me

Kunena the leading forum solution for both Joomla 1.5 and 1.6

Like in this site... here is Joomla! 1.5 and this Kunena 1.6

We use Joomla 1.5.11 at the moment, and because of some customized components I don't want to upgrade now, if there is any chance to keep this Version working

I am sorry to hear that you are having problems with Joomla 1.5.11 ... but K 1.5.13 was designed to work with J! 1.5.14 as stated in the technical requirements document . There is not much that we can do about that now.